A pneumatic tyre with low gas permeability

Abstract

A pneumatic tire is for a motor vehicle. The pneumatic tire includes a first side that is an inner side of the pneumatic tire, and an opposite second side. A least a part of the pneumatic tire has rubber-based material that is configured to restrict gas permeability and that includes lignin that has been treated by hydrothermal carbonization. The rubber-based material or a coating of the rubber-based material forms at least a part of the first side of the pneumatic tire. A method is for manufacturing a pneumatic tire.

1 . A pneumatic tire for a motor vehicle, the pneumatic ye tire comprising:
 rubber-based material
 configured to restrict gas permeability and 
 comprising lignin that has been treated by hydrothermal carbonization, 
   a first side that is an inner side of the pneumatic tire,   an opposite second side, and   reinforcing material,   wherein the rubber-based material or a coating of the rubber-based material forms at least a part of the first side of the pneumatic tire, and   wherein at least some of the rubber-based material comprising lignin that has been treated by hydrothermal carbonization is arranged between the inner side of the pneumatic tire and the reinforcing material.   
     
     
         2 - 30 . (canceled) 
     
     
         31 . The pneumatic tire of  claim 1 , wherein:
 the rubber-based material comprises at least 3 wt % lignin that has been treated by hydrothermal carbonization.   
     
     
         32 . The pneumatic tire of  claim 1 , wherein
 the rubber-based material comprises at most 40 wt % lignin that has been treated by hydrothermal carbonization.   
     
     
         33 . The pneumatic tire of  claim 1 , wherein
 the rubber-based material comprises magnesium oxide (MgO) and/or zinc oxide (ZnO.   
     
     
         34 . The pneumatic tire of  claim 1 ,
 wherein the rubber-based material forms at least a part of the first side of the pneumatic tire and/or   the pneumatic tire comprises a coating of the rubber-based material, the coating forming at least a part of the first side of the pneumatic tire, and   a thickness of the coating is at most 4 cm.   
     
     
         35 . The pneumatic tire of  claim 1 , wherein
 the rubber-based material comprises butyl rubber,   the rubber-based material comprises natural rubber and butyl rubber.   
     
     
         36 . The pneumatic tire of  claim 1 , wherein
 the rubber-based material comprises at least one of chlorobutyl rubber and bromobutyl rubber.   
     
     
         37 . The pneumatic tire of  claim 1 , wherein:
 the rubber-based material has been manufactured by mixing with a rubber based matrix material HTC-lignin of which specific surface area is from 7 m 2 /g to 150 m 2 /g, when measured according to ASTM D-6556-10, and/or   the HTC-lignin that is mixed with the rubber based matrix material has an oil absorption number of from 50 ml/100 g to 130 ml/100 g.   
     
     
         38 . The pneumatic tire of  claim 1 , comprising:
 second material such that   the second material forms a tread of the pneumatic tire, and   the second material is a rubber-based material and different from the rubber-based material configured to restrict gas permeability.   
     
     
         39 . The pneumatic tire of  claim 1 , wherein:
 the reinforcing material comprises fibrous material, textile, or metal.   
     
     
         40 . The pneumatic tire of  claim 1 , comprising an innerliner, wherein:
 the innerliner comprises the rubber-based material;   the pneumatic tire comprises tire inside paint and/or self-sealant material and/or noise cancelling foam arranged to form at least a part of the first side.   
     
     
         41 . The pneumatic tire of  claim 1 , comprising self-sealant material, wherein:
 the self-sealant material forms at least a part of the first side and   the self-sealant material comprises the rubber-based material.   
     
     
         42 . The pneumatic tire of  claim 1 , the pneumatic tire comprising:
 at least one of an information carrier carrying first information and a database comprising second information, wherein the first information and/or the second information is indicative of the pneumatic tire having low gas permeability.   
     
     
         43 . A method for manufacturing a pneumatic tire for a motor vehicle, the method comprising:
 arranging a rubber-based component onto a building drum to form a tubular preform for the pneumatic tire for a motor vehicle,   expanding the tubular preform to form a carcass of the pneumatic tire,   arranging a metal component and a textile component onto the carcass, thereby manufacturing a preform of the pneumatic tire,   curing the preform of a pneumatic tire, thereby bonding the components together by means of curing,   receiving rubber-based material that has been formed by mixing lignin that has been treated by hydrothermal carbonization and rubber-based matrix material for restricting gas permeability of the rubber-based material, and   arranging the rubber-based material onto the building drum before said expanding the tubular preform to form a carcass of the pneumatic tire, and/or   arranging the rubber-based material onto an inner surface of the carcass, the method comprising:   arranging reinforcing material such that at least some of the rubber-based material that comprises lignin that has been treated by hydrothermal carbonization is arranged between the inner side of the pneumatic tire and the reinforcing material.   
     
     
         44 . The method of  claim 43 , comprising:
 receiving or forming an innerliner comprising the rubber-based material and   arranging the innerliner onto the building drum before said expanding the tubular preform to form a carcass of the pneumatic tire or   arranging the innerliner onto an inner surface of the carcass.   
     
     
         45 . The method of  claim 43 , wherein:
 the rubber-based material or comprises butyl rubber,   such as halobutyl rubber.   
     
     
         46 . The method of  claim 43 , wherein:
 the rubber-based material comprises at least 3 wt % lignin that has been treated by hydrothermal carbonization.   
     
     
         47 . The method of  claim 43 , wherein:
 the rubber-based material comprises at most 40 wt % lignin that has been treated by hydrothermal carbonization.   
     
     
         48 . The method of any of claim  22 , wherein:
 the rubber-based material comprises magnesium oxide (MgO) and/or zinc oxide (ZnO).   
     
     
         49 . The method of claim  22 , comprising:
 arranging the rubber-based material onto the building drum before said expanding the tubular preform to form a carcass of the pneumatic tire such that the rubber-based material forms a radially innermost layer of the materials arranged on the building drum.   
     
     
         50 . The method of the  claim 38 , wherein:
 the innerliner comprises halobutyl rubber.